Allis Chalmers B Hydraulic Questions

I just purchased my first tractor tonight and noticed an issue with the hydraulics.  When I engage the pto, the 3 point raises but the lever that controls the up and down of the 3 points appears to be frozen so I can't lower it without disengaging the hydraulics.  On the pump, it looks like a throttle body on a carb and it will not move.  Anyone have any ideas what it could be and if it's super expensive to fix?  Thanks in advance.

Thank you.  So I should be able to pull the pump off the side and get it freed up where it will rotate?  Will anything shoot out on me?  Thanks for the help, I'm wondering if I should return the tractor or not.

Here's a picture (hopefully, if I get it to work.)  The lever attached to the seat will not move.  It's like the small rotating part that it attaches to is frozen.  If it just needs cleaned, hopefully it's not a huge deal.  If it's something expensive, I've got a problem.

No, the handle wiggles around and I can move it from side to side.  

Thank you a ton for your help.  I will go soak it with penetrating oil tonight and check it tomorrow.  I have checked and all of the linkages themselves are free but I guess I just can't figure out what actuates the pump or valve body itself.  If it doesn't work, I'll try to take a few better pictures and maybe that will help.  I'm going to get a manual but it seems like no reason to try to return the tractor.  Thanks again for you help and I might need more in the very near future! 

Those are the parts that I thought should rotate and they don't.  I soaked them and I'll try to pry on them and see what happens.  If I need to pull the whole assembly, do I just take out the 4 bolts and it pulls out or do I need to disconnect something on the inside of the transmission?  Those circle plates you are talking about do not appear to move whatsoever but I will try to break them loose tomorrow.

Thank you both.  Being brand new at this, I'm sure I will have more questions but I'm hoping to get it fixed and working because I have a nice blade for it and snows getting close!  Thanks again and it's awesome to find a forum with such great people.

As for the fluid, hopefully the manual will tell me what I need and how to change it all.  It sat outside for quite some time and was not used much while he had it so I would say I need to drain every bit of fluid, oil and grease and change everything.

Check out the parts section of this website.  Several good suppliers supporting this website!

That's a nice clean,well cared for B ! You 'dun good'.Just keep her full of gas, check the oil and have FUN !!

If you cant get the circular plates loose, then you will probalby need to remove the pump. The 4 bolts just take out, then wiggle out the pump. YOu will  see two plungers with rollers at the end. Inside the PTO case there are two cams that rotatae and the rollers run on them and push the two pistons in and out. YOU do have to drain the oil first. There are three 1/2 inch plugs on the bottom of the trans, differential, and PTO housing. You will get 2 gallons total drain. YOu need some thin weight oil like hytrans, universal tractor fluid, or 20 wt motor oil for refill. --- With the pump off, you might be able to set in a gallon can of penetrant and let it soak, or get a better grab on the circular parts. You pump internal obviously works since the 3 point goes up.  I would not tear it appart untill i got the circular discs losses. You may not have to disassemble.--- THe discs i believe are pinned on with a small roll pin. Maybe take the pin out and take the discs off and wire brush, then turn the shaft by vice grip to test.

Jack up or run the right rear tire up on a couple of blocks and you'll loose less oil and make it a bit easyer to get at the bolts holding the pump on. I use hytran but origional recommendation was 20 wt. 

Yes, I will definitely put some more pictures on here.  I pulled the serial number last night and it is B120223 so I figured it to be a 1952.

As for the distributor, it has a 12v alternator on the other side so I just figured the thing has been switched from 6v.   I know a little bit more about 8ns and when I was looking at them I noticed that was very common so I assumed the same for the or any other 12v so it was easier to start.

Ok, I've got an update.  I sprayed the two outside sheetmetal plates/discs last night  with penetrating oil and tonight I was able to break it free by tapping it lightly with a hammer and get the entire lever and entire assembly to rotate.  I can also see the center shaft of the pump rotating.  Now, when I start the tractor up and engage the pto, the 3-point raises but I still cannot get it to lower, even with weight on it.  Any ideas now? I'm a little limited on space during the winter to tear it apart and I don't want to do it outside unless I can get it back up and running pretty quickly. 

Also, is there a rebuild kit available that's got all of the valves, balls, seats etc. available if this is the problem? I've been having trouble finding anything as far as hydraulic parts for this tractor, even on this sight unless I've completely missed it.  As I said before, this is all brand new but your words of wisdom have already started to build my confidence enough to dig into it.  Thanks again for all the great help.

steve(ill) wrote: For your information, your B is a little bit "special". Most Bs have a wishbone front alxe and the rear hubs press on a splined shaft. A few had a straight front axle that has adjustable width. To go with that the rear alxes were changed to a 5 bolt on pattern like an automobile rim... Thats what you got.. nice unit.

This is interesting.  I noticed that the front was adjustable but just assumed that it was somewhat standard for that year.  I would be interested in learning a little more about it.

Yes, they do move separately now.